cant do cardio for more than a few hours without pain

[Super_Ectomorph]

OK didn't know here else to post this, is kinda related to fat loss, as it's impeding it, heh.

I'm 27 years old. Ive been weight training since 18, with a few on and off periods. I have a nagging pain in my lower back and occasionally shoulders. But don't have anything serious enough for a doctor to have taken seriously (certainly not a sharp pain) I'm trying to lose weight fast. I'm at a pretty big calorie deficit, but I really don't care if i lose some muscle too, I am sick of being flabby nowadays.

I'm weight training 3 days a week (not pushing too hard) and doing an hour of pretty hard running on the treadmill another 3 days a week.
Yeah that's fine.

However I'm pushing myself a bit more than that. after either the weights or the running, I try to do another 3 hours of gentle cardio (I have audiobooks, I figure I may as well read it whilst exercising rather than sat down) I either go on the treadmill or the elliptical cross trainer thingy. If i walk more than an hour, I start getting a very annoying dull ache in my hips.. and the cross trainer hurts my lower to mid back for a day.

This is only additional GENTLE exercise though, I am only 27. Is this normal? How the hell do people train for marathons? I heard of swimemrs doing many hours a day etc.
Am I just injured, or just getting old? Thanks.

[lee__d]

While I'm sure you would eventually get used to walking for 3 hours, why the hell would you want to. You already run 3x a week...

[Askie]

Isn't it obvious, suppose not otherwise you wouldn't be asking.

You are doing high impact cardio with a back injury, and 3 to 4 hours a day.

[fatinNYC]

cardio for a few.... hours?

[Super_Ectomorph]

While I'm sure you would eventually get used to walking for 3 hours, why the hell would you want to. You already run 3x a week...

i just want to burn a few extra calories a week, id be sat down listening to the book anyway.

askie
You are doing high impact cardio with a back injury, and 3 to 4 hours a day.

its low impact for that period. high impact 3x1 hours a week.

[Crooktele79]

You should make the weight training your top priority and cut out some of the cardio. If you want to lose fat adjust your diet accordingly. 3 hours of cardio a day is ludicrous...